Process of making plaster-board.



1.6L]A E. SCHUMACHER. PROCESS 0F MAKiNG PLASTER BOARD.

APPLfCATmN FILED AUG.G.1915.

2 SiiEETSvSHEET I.

M/ I @ff/14% www,

l. & J. E. SCHUMACHER.

vPROCESS or MAKING PLAsTm BOARD.

APPLICATION FILED AUG.51915.

' jvVEN'IIIIRS wlTNESSESr' W /TH-Em ATTURNEY 'llldlllitllf JOHN PROCESS 0F MAKING PLASTER-BORD.

Naumann-ngi Specification. of Letters Patent.

lfateiiteill Mar. 28, i916.,

Application filed August G, 1915. Sera] No. 43,943. i

7h ZZ vr/wm t may concern lle it lrnovvn that we, Join: Sanoma-enna and Jessen E. SciroMAci-iea, both citizens of the llnited States, residingat Los iing'eles, in the county oit Los ngeles and IState of California, hare jointly invented a new and useful Process ot lvlalring Plaster- Board, of which the following is a. specification.

This invention relates to improvl'ed proc.- esses ot making master-hoard such as is used in the building arts, both :tor internal and external Walls; such plaster-board. is usually formed ot strips or sheets of paper, paper hoard, or the like, between which is provided a. suitable plastic materiaL which may be o't` any desired composition, as for instance, plaster, cement or compositions` ot the same, including finely divided materials of various sorts. 'Y

ln the manufacture of sach plaster-board, as ordinarily carried on, it is dillicult to prevent warping oil the product, and the same must be handled with great care immediately alter the component parts of the same are assembled, due to the fact that the sheets are singly formed, the plaster allowed to set, .and the. sheets then removed, these steps being coupled with an extraordinary absorption ot' time and labor. Farther diliculties arise from theI fact that ordinarily the paper or paper stock between which the pla stie layer is interposed, and with which it afterward unites, becomes saturated 'with moisture from the ivet plastic composition, peeling and tearing it attempts to handle the same are made betere sutlicient'tiine has elapsed tor the plaster to set and the paper to dry and rena in its firmness.

ln arcor-dance with the presentinvention, a pluralit)- of the sheets ot plaster-hoard, each comprising;` the tuvo sheets ot paper with the interposed layer ot plastic materi al; are stacked upon suitable beds or trays, bein;r ted or advanced successively thereto abili` internally moist and externally dry, allowed to remain in such stacked condition while the paper coatinf ol: each sheet nl plaster-board becomes saturated with moisture. the plastic composition ol such sheets 'it plaster boardv allowed to set or harden. the entire mass ot sheets so stacked e\pandin evenljv. become stretched of' expanded to its limit. nill not further stretch. expand. warp or curl, should iii-mature be applied to the same ot separate units may non' be .procedures above pointed The paper haringthus after it has been applied to the Wall or walls or otherwise pnt in use. Furthern'iore, the paper or paper stoel; used will preferably lave lleen so treated or iin )regnated with such proper substance or substances, previously to the formation oi' the plaster-board slucts, that .the saturation of the paper by moisture from the plastic substance is delayed, permitting the several plaster-hoard sheets to he built up and handled in flexible condition during the stacking operation. After each tray has been loaded with a plurality of sheets of the plaster-board still in flexible condition, such tray, remaining in horizontal position is set aside that the plastic composition may set or harden and the entire mass driY out. After such setting and drying of the mass on each tray, the entire mass still in position on its respective tray may be trimmed at the edges, the cut being taken through all of the sheets of plasterboard comprising such mass, this resulting in a perfectly lsmooth edge, no further trimming of the product being' required before marketing and putting' intense such product, as perfect butt joints can be made with the units so treated. Each tray with its load raised on edge and the sheets of plaster-hoard removed one by one for iinal drying in spaced relation.`

lilith the above and other objects in View, the invention consists in the novel and useful combination or association of steps and out, and which may be carried on with any suitable apparatus, as exemplified in the showing of the accompanying drawings. and as hereinafter particularly pointed out with reference to such drawings, and .finally pointed out in claims.

The drawings disclose one farm of apparatus susceptible to thev f arryirngy on of the improved process, it being` understood that the process is in no sense lin'lited in its utilization to such particular design or construction as illustra ted.

ln the drawings: Figure l is a. fragmentary side elevation ot apparatus suitable YFor carrying out certain steps or" the process:

iii 2 is a plan view oli the. showin;r in Fig. l: 3 is a plan new ot a plurality7 of trays loaded with the stacked Iiilaster-board sheets: his?. #l is an enlarged isometric view of one ol the trays with its respective stack ot' plaster-board sheets before the trimming operation. and a'tter the plastic composition rights 9, it .t

has set; and, Fig. 5 is a view similar to Figi 4, but showing the plaster-board as trimmed with the sheets ready for removal from the tray, one by one.

Corresponding parts in all the iigures are designated by the saine reference characters. The manner of carrying on the improved process constituting this invci'ition with. particularreference to the apparatus shown in the drawings, will be readily understood from the foregoing description taken in conu nection with the accompanying drawings and the following statement. A lle ring with particular-ity to the dravvings, i designates advancing or feeding; means for the plaster-board while in liexible condition, B designates the plaste1.board,

l and trays for receiving the plasterboard are designated by C.

The advancing or feeding n ns A preferably comprises an endless conveyor belt 6, the upper side of which rides over aA table top 7, such table top 7 being supported on a suitable fameworl; 8 supported upon up- -ing understood that the beltpasses about :rollers l() journaled in the frame-Werl;- as at 10a, only one such roller being shown, suitable driving means for the belt, not shown, being provided. The plastenboard il tied by such conveyor, as liereinbeforc des fibed, comprises the several units I), each o which is composed of two sheets of flexible paper, paper board or the like, preti-)reilly preriously treated to delay saturation., with tno interposed layer of plastic composition, such sheets being ted successively by the conveyor to the trays C, each tray being renie ed after receiving its stack 'of plasterbca; l units l) and the next succeeding tray put iiif its place` The trays C preeraciy each comprise a liat horizontal table toi il supported on suitable transverse ,me 3 i2, and provided with a. side Wall .rided 'into two portions 13 and' lei, such wall acting as a guide member against which the sheets may be placed to properly aline the saine on the tray. This wall also serves to support the mass of units 7; when the tray is later tilted on edge for singly removing the sheets.

it will be understood that the plaster boardB, that is, the successivo units' thereof, may he applied or ied to the trav in other manners thai.I by the conveyor illustrated, the plaster-board units being so applied to the tray in rough or first cuts or approximately the saine length, and the side edges of such boards as they are applied to the tray are as formed in tlieprocess ot apply'- ing the plastic composition to the lower sheet of paper, and applying` the upper sheet of paper over the. plastic con'ipositicn, and consequently ordinarily require further Enel aseo trimming. This trimming is done after the plastic composition i's set and the massed or stacked units b have dried snllieiently to be lirin, the trimming operation being per- 'orined without removal` of the mass from its respective tray, thus giving a clean cut, as illusrated in Fig: 5. i. A

Having thus disclosed our invention, We claim and desire to secure by Letters Patent:

l. '.lhe herein disclosed process of making plaster-board and the like, consisting in applying a sheet of the same to a suitable surface, and super/*posing other sheets of the same thereon to form a stack of such sheets all internally moist but initially externally dry and each in superiicial contact with the next adjacent sheet or sheets in which position they are' caused to harden or set.

2. The herein disclosed process of melting plaster-board and the like, consisting in ap plying a sheet ci the same to a Suitable surface, superposing other sheets ot the same thereon to forni stack ot' such sheets all internally moist but initially externally dry and each in superficial contact with the next adjacent sheet or sheets in which position they are caused to harden or set, and i iining the same while still in stacked relation..

ie herein disclosesd process of mak- Aaboard com prising` paper surface d plastic composition, consisting ig 'to a suitable tray or `the like a L.lit-y of internally moist flexible sheets the saine before pernieaton by moisture ot the paper surfaces invading from the plastic composition of such sheets, and staolringthe saine `in superposed relation and superficial contact upon the tray in which position. they are caused to harden or set.

4. The herein disclosed process of making plaster-board comprising` paper surface` sheets and plastic composition, consisting in advancing; to a. suitable tray or the like a plurality of internally moist flexiblesheets of the same before permcation by moisture of the paper surfaces invading` from the plastic composition. of such sneets, stacking the same in superpcsed relation and superiicial contact upon the tray in which position they are caused to harden or set, and then trimming the same while still in stacked relation upon the tray.

ln testimony whereof, we have signed our names to this specification in the presence of two subscribing` Witnesses.

JOHN SCI-lUidACilER.

JOSEPH SCHUMACHER lVitnesses Amman Il. DAEHLER, FRANCIS L. lsomcc. 

